Very high contrast in indoor model
The contrast primarily depends on the light in the scene. If it's one strong small light source, there will be more contrast. If there was some light maybe coming from the windows, or other light sources, the lighting would be more uniform and there would be less contrast. Obviously to have ambient lighting you need the light to be able to bounce around the scene, so render settings should allow calculating enough of light bounces: 



It does not have to be 128 bounces for everything, just make sure there are a few where it makes sense.